Abstract:In order to find out kast groundwater organic contamination, through statistics and analysis on organic matter content test results gained from 100 groundwater samples in study area, 4 organic matters, such as haloalkane, aromatichydrocarbon, chlorobenzene and organochloride have been found out. The maximum number of detection is chloroform and trichloroethylene. They both belong to haloalkane, but the test value is very low and is much lower than "Standards for Drinking Water Quality" (GB57492006) standard limits. It is showed that groundwater has been contaminated, but is much lower than drinking water quality limits. The pollution degree is low. The high value of groundwater organic content has close relation with sewage discharge and waste discharge.